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Section 13 Serial Communication Interface
Bit 5—Parity Enable (PE): In asynchronous mode, this bit enables or disables the addition of a
parity bit to transmit data, and the checking of the parity bit in receive data. In synchronous mode,
the parity bit is neither added nor checked, regardless of the PE bit setting.
Bit 5
PE
Description
0
Parity bit not added or checked
1
Parity bit added and checked*
Note: * When PE bit is set to 1, an even or odd parity bit is added to transmit data according to the
even or odd parity mode selection by the O/E bit, and the parity bit in receive data is
checked to see that it matches the even or odd mode selected by the O/E bit.
Bit 4—Parity Mode (O/E E E E ): Selects even or odd parity. The O/E bit setting is only valid when the
PE bit is set to 1, enabling parity bit addition and checking, in asynchronous mode. The O/E bit
setting is ignored in synchronous mode, or when parity addition and checking is disabled in
asynchronous mode.
Bit 4
O/E E E E
Description
Even parity *
0
Odd parity *
1
Notes: 1. When even parity is selected, the parity bit added to transmit data makes an even
number of 1s in the transmitted character and parity bit combined. Receive data must
have an even number of 1s in the received character and parity bit combined.
2. When odd parity is selected, the parity bit added to transmit data makes an odd number
of 1s in the transmitted character and parity bit combined. Receive data must have an
odd number of 1s in the received character and parity bit combined.
Bit 3—Stop Bit Length (STOP): Selects one or two stop bits in asynchronous mode. This setting
is used only in asynchronous mode. In synchronous mod no stop bit is added, so the STOP bit
setting is ignored.
Bit 3
STOP
Description
1 stop bit *
0
2 stop bits *
1
Notes: 1. One stop bit (with value 1) is added to the end of each transmitted character.
2. Two stop bits (with value 1) are added to the end of each transmitted character.
Rev. 4.00 Jan 26, 2006 page 486 of 938
REJ09B0276-0400
1
2
1
2
(Initial value)
(Initial value)
(Initial value)
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